Dual mode AC motor drive system

Details Dual mode AC motor drive system Dual mode AC motor drive system

1979-04-24

1981-07-28

Witkowski, S. J.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318810, H02P 742, H02P 758

Patent

active

042812763

ABSTRACT:
Disclosed is an AC motor drive system having a variable frequency, variable magnitude AC current supplied from a controlled inverter coupled to a variable DC current source in the form of a converter by way of a DC link including an inductor. The AC motor load is controlled so as to have dual modes of operation in order to optimize torque at any speed which can be produced within the voltage and current limitations of the variable frequency power source. The first mode comprises a constant slip or constant angle mode for operating speeds up to the corner point speed which is defined as the speed at which the motor voltage at full torque matches the maximum voltage the variable frequency inverter coupled thereto can provide. Thereafter, the system enters the second mode by automatically shifting to a constant horsepower variable slip or changing angle mode for operating speeds beyond the corner point speed.

REFERENCES:
patent: 3769564 (1973-10-01), Rettig
patent: 3838322 (1974-09-01), Greenwell
patent: 3983463 (1976-09-01), Nabae et al.
patent: 4009427 (1977-02-01), Takahashi
patent: 4019105 (1977-04-01), Cornell et al.
patent: 4088934 (1978-05-01), D'Atre et al.
patent: 4230979 (1980-10-01), Espelage et al.

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